package miao.demo.dao.impl;

import miao.demo.dao.BookDao;

public class BookDaoImpl implements BookDao {
    //无参构造器--bean实例化方式之一
    private BookDaoImpl(){
        System.out.println("book dao construct is running");
    }
    private BookDaoImpl(int i){
        System.out.println("book dao construct is running");
    }
    @Override
    public void save() {
        System.out.println("book dao save....");
    }
}
